Sighting-gear for guns



33-237- GR 193979765 SR H. W. LEE AND R. MORRISON. SIGHTING GEAR FOR GUNS.

. APPLICATION FILED MAR. 23. 1920. 1 ,3975765. Patented NOV. 22, 1921.

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UNITED STATES PATENT QFFiQE.

HUGH HARE-EN LEE AND ROBERT MORRISON, OF NEIVCASTLE-UPON-TYNE, ENGLAND, ASSIGNORS TO SIR W. G. ARMSTRONG, WHIT'WORTH AND COMPANY, LIMITED, F NEWCASTLE-UPON-T'YNE, ENGLAND.

SIGHTING-GEAR FOR eons.

Specification of Letters Patent. Patented NOV, 22, 1921.

Application filed March 23, 1920. Serial No. 368,182.

To all whom it may GOILCG'IW'L.

Be it known that we, HUGH lVAnnEN LEE and ROBERT MORRISON, subjects of the King of Great Britain, both residing at Elswick Works, Newcastle upon Tyne, England, have invented new and useful Improvements in Sighting-Gears for Guns, of which the following is a specification.

This invention relates to improvements in sighting gears fitted to gun mountings and .is especially suitable for use with guns controlled by director instruments especially when the guns are capable of being fired at a high angle.

The range registering dial of a controlled sight is graduated equally for equal increments of range, but since the angle of elevation does not bear a direct relation to the range the laying angle must be controlled by means of a cam motion and imparted to the sight. When it is necessary to provide for a wide range of elevation the cam becomes inconveniently large, and the principal object of this invention is to provide means for setting the sight at the required laying angle by the use of only a small cam.

According to this invention we control the sight by a cam which besides being rotated is also movable with its shaft so that the position of the sight relatively to the gun is dependent upon the movement of translation of the cam and its shaft as well as upon the movement of rotation of the cam about its axis.

Our invention is illustrated by the accompanying drawings, Figure 1 of which is a side elevation, Fig. 2 a front view partly in section, Fig. 3 is a transverse part section and Fig. 4 is a part section at right angles to Fig. 3.

1 is a bracket rigidly secured to the trunnion 2 of the gun mounting and having projecting from it a stud 3 on which is pivoted an arm 4: which carries a telescope 5 and which has depending from it guides 6 struck from a point in the trunnion axis as center; in these guides can move a slider 7 in which is journaled a shaft 8 having fast upon it a range dial 9 and a pinion 10 meshing with a segmental rack 11 on the bracket 1. 12 1s a worm wheel keyed on the shaft 8 and meshing with a worm 13 which can be turned by means of a hand wheel 11. Also fast on the shaft 8 are two cams 15 on which rest rollers 16 mounted on a spindle 17 journaled in the upper parts of the guides 6. The weight of the arm and telescope is usually sufficient to keep the rollers 16 in cont-act with the cams 15, but if necessary a spring may be added.

It will be seen that on turning handle 14: pinion 10 will travel down rack 11 and slider T and cams 15 will also travel down, but cams 15 will also be turned about the axis of shaft 8 so that the movement of arm 4 and therefore of telescope 5 relative to the gun will be the algebraic sum of the movement of slider 7 relative to rack 11, the slider having equal angular movement for equal intervals of range, and of movement of rotation of cams 15.

What we claim is 1. In gun sighting gear, the combination of a gun trunnion, a transverse shaft, means for moving the shaft around the trunnion axis, a cam upon the shaft, means for rotating the cam upon the shaft, an arm having one end pivoted about the trunnion aXis and the other end supported by the cam and a sight carried by the arm.

2. In gun sighting gear, the combination of a gun trunnion, a segmental rack fast on a trunnion of the gun, a transverse shaft, a pinion fast on the shaft and meshing with the rack, a cam fast on the shaft, means for rotating the shaft, an arm having one end pivoted about the trunnion axis and the other end supported by the cam and a sight carried by the arm.

3. In gun sighting gear, the combination of a gun trunnion, an arm pivoted about the trunnion axis, a sight carried by the arm, guides fast on the arm, a segmental rack fast on the trunnion, a slider capable of movement in the guides, a pinion carried by the slider and meshing with the rack, means carried by the slider for rotating the pinion, a cam fast with the pinion and a member carried by the arm and resting upon the cam.

4:. In gun sighting mechanism, the combination of a gun trunnion, an arm pivoted about the trunnion axis, a sight carried by the arm, guides fast on the arm, a segmental rack fast on the trunnion, a slider capable of movement in the guides, a pinion carried by the slider and meshing with the rack, means carried by the slider for rotating the pinion, a pair of cams fast with the pinion, a spindle journaled in the arm and rollers on the spindle resting on the cams.

In testimony that We claim the foregoing 10 as our invention We have signed our names this twenty-third day of February, 1921.

HUGH WARREN LEE. ROBERT MORRISON. 

